The OL eitor iButton (1-Wire) is a contact point that validates the key with a quick and precise touch . Built for heavy use , with stainless steel contacts, it offers reliability and stable reading for years. It has an integrated LED indicator ( red , lights up when access is unauthorized), or it can be installed without an LED indicator . Compatible with the Projtecs 1-Wire controller, it operates on low voltage and is easy to install on doors, gates, and panels.